184 THE MARINE BOTANIST. 



nous, continuous, cellular ; the central cells large^ 

 those of the surface minute. Fructification ; 

 1. convex tubercles (coccidia) containing- minute 

 spores I 2. tetraspores imbedded in the sui-face 



cells. 



GRACILARIA CONPERVOIDES.— 

 FILIFORM GRACILARIA. 



Fronds from three to twenty inches hig-h, cylin- 

 drical, cartilag-inous, forked, more or less set with 

 slender ramuli, tapering^ upwards. The tubercles 

 are large and very common, forming- one of the 

 most conspicuous characters in this species. Colour 

 a deep red. Rigid in substance, and not adhering* 

 to paper. Tetraspores minute, imbedded in the 

 branches. Grows in sandy tide-pools, not unfre- 

 quent. Perennial. Produces fruit in summer and 

 autumn. There are three varieties of this plant : 

 viz. — /3 procerrimay with long*, g-enerally simple 

 and naked branches ; y alhida, frond compressed, 

 mostly dichotomous, ramuli awl-shaped ^ 2 genicu-^ 



